Retailers don't hand out discounts to club card members out of the goodness of their hearts; they do it so they can track your purchases and mine your data. If you're not keen on all that tracking, web site Club Card Shuffle hands out club card IDs for your corporate subversion pleasure.

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As the site puts it:

The goal of this site is to screw up the data that different club cards generate to manipulate your buying habits by anonymously storing and trading your club card numbers. Corporate subversion in its lamest form. Have fun.

Once you've got your card number, you could use a service like KeyRingThing (webapp) or KeyRing (for iPhone, Android, and Windows Phone 7) to generate your club cards, or you could make your own consolidated loyalty card. Right now the service only supports 19 retailers, but they say they're willing to add more if you email them.